Born in The Bronx, New York City, Cohn was the only child of Dora Marcus (1892–1967) and Judge Albert Cohn (1885–1959), who was influential in Democratic Party politics. He lived in his parents‘ home until his mother’s death, after which he lived in New York, the District of Columbia, and Greenwich, Connecticut.
Roy Marcus Cohn (February 20, 1927 – August 2, 1986) was an American attorney who became famous during Senator Joseph McCarthy’s investigations into Communist activity in the United States during the Second Red Scare. Cohn gained special prominence during the Army-McCarthy Hearings. He was also an important member of the U.S. Department of Justice’s prosecution team at the espionage trials of Soviet spies Julius and Ethel Rosenberg.